34 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



Adult shell letss than 7 mm. long — Continued. 

 Summit of the whorls not tabulated. 



Intercostal spaces terminating a little posterior to the suture. 



WTiorlsslopingly shouldered, summit appressed santarosana, p. 36. 



^^^lorl^ narrowly squarely shouldered, summit not appressed 



paramoea, p. 37. 

 Intercostal spaces not terminating posterior to the suture. 



Axial ribs strongly protractive houseri, p. 37. 



Axial ribs not strongly protractive. 



Shell very slender, acicular aculeiis, p. 38. 



Shell conic. 



Whorls narrowly equally shouldered at the summit. 



Axial ribs vertical muricatoides, p. 38. 



Axial ribs protractive, sinuous kelseyi, p. 39. 



Whorls almost appressed at the summits raymondi, p. 39. 



TURBONILLA (CHEMNITZIA) HYPOUSPA, new species. 

 Plate 2, figs. 5, 5a. 



Shell broadly conic, yellowish- white. Nuclear whorls very small, 

 two and one-half, forming a rather elevated helicoid spire, the axis 

 of which is at right angles to that of the succeeding turns, in the 

 first of which it is a little more than half immersed. Post-nuclear 

 whorls well rounded, slightl}" shouldered at summit, marked by very 

 strong, sublamellar, protractive axial ribs, of which 14 occur upon 

 the second and third, 16 upon the fourth to eighth, 18 upon the 

 ninth and tenth, 20 upon the eleventh, 24 upon the twelfth, and 25 

 upon the penultimate tin-n. On the early whorls these ribs are very 

 strong in the middle, bending suddenly toward the summit, which 

 gives them a decidedly angulated appearance a little below their 

 termination; on the last three whorls they are more closely crowded 

 and less strongly developed. Intercostal spaces about one and one- 

 half times as wide as the ribs on the early whorls; on the last three 

 they are about equal to them, w^ell impressed, terminating a little 

 above the sutures. Sutures well marked. Periphery of the last whorl 

 slightly angulated. Base short, well rounded. Aperture rhomboidal ; 

 columella slender, somewhat curved, and slightly reflected. 



The two cotypes (Cat. no. 206851, U.S.N. M.) were dredged by 

 the University of California at station 43, off San Diego, California. 

 One of these is a young specimen with the nucleus; tlie other has the 

 last eleven whorls and measures : Length 8.1 mm., diameter 2 mm. 



The University of California has another specimen from the same 

 lot (Cat. no. 206852, U.S.N.M.), one specimen from San Diego. 

 Cat. no. 205940, U.S.N.M., one specimen dredged by the University 

 of California, at station 32, off Catalina Island; also two specimens 

 dredged at stations 47 and 73, off San Diego. 



